CSS中的特定目标元素？

Question

大家早上好，

我不设法用相同的div父母的..fa插入-向下或向上(在i和span内)的aaria-展开=true，你知道怎么做吗？

我尝试使用选择器~，或者移动fa插入符号(并成功)，但是您在这里真的很好，所以这里有一个简单的代码版本，如果您能找到解决方案的话。

谢谢！

<style>
    a[aria-expanded="true"]  .fa-caret-up {
        display: none;
    }
    a[aria-expanded="false"] .fa-caret-down {
        display: none;
    }
</style>

<div class="container-fluid d-flex justify-content-center">
    <div class="row">
    
        <div class="col-lg-4 col-md-6 col-12 pb-5">
            <h4 class="text-center">eCampus</h4>
            
            <div class="d-flex justify-content-between align-items-center">
                <a href="#" data-toggle="collapse" data-target="#footer_ups" aria-expanded="false" aria-controls="footer_ups">
                    <span class="flex-grow-1 mr-5"><i class="fa fa-chevron-right pr-2"></i>Universit&eacute; Paris-Saclay</span>
                </a>
                <span class="badge badge-primary badge-pill">7 <i class="fa fa-caret-down"></i><i class="fa fa-caret-up"></i></span>
            </div>
            
            <div id="footer_ups" class="collapse pl-3" aria-labelledby="Établissements de l'Universit&eacute; Paris-Saclay">
                <ul class="list-unstyled">
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                </ul>
            </div>
            
            <div class="d-flex justify-content-between align-items-center">
                <a href="#" class="text-nowrap pr-5" data-toggle="collapse" data-target="#footer_ipp" aria-expanded="false" aria-controls="footer_ipp">
                    <span><i class="fa fa-chevron-right pr-2"></i>Institut Polytechnique de Paris</span>
                </a>
                <span class="badge badge-primary badge-pill">4 <i class="footer_ipp_glyph fa fa-caret-down"></i></span>
            </div>
            
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                    <li><i class="fa fa-angle-right pr-2"></i> <a href="https://www.telecom-paris.fr" alt="Site internet de Télécom Paris" target="_blank">Télécom Paris</a></li>
                    <li><i class="fa fa-angle-right pr-2"></i> <a href="https://www.telecom-evolution.fr" alt="Site internet de T&eacute;l&eacute;com Evolution" target="_blank">T&eacute;l&eacute;com Evolution</a></li>
                </ul>
            </div>
            
            <br />
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        </div>
        
        
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                <li><i class="fa fa-chevron-right pr-2"></i><a href="">Aide et accessibilit&eacute;</a></li>
                <li>&nbsp;<li>
                <li><i class="fa fa-chevron-right pr-2"></i><a href="">Conditions g&eacute;n&eacute;rales d'utilisation</a></li>    
                <li><i class="fa fa-chevron-right pr-2"></i><a href="">Cr&eacute;dits</a></li>  
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                <li>&nbsp;<li>
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            </ul>
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            <a href="https://www.facebook.com/UParisSaclay" alt="Facebook de l'Universit&eacute; Paris-Saclay" target="_blank"><i class="fa fa-facebook-square fa-3x mr-3"></i></a>
            <a href="https://twitter.com/UnivParisSaclay" alt="Twitter de l'Universit&eacute; Paris-Saclay" target="_blank"><i class="fa fa-twitter-square fa-3x mr-3"></i></a>
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</div>

Answer 1

如果您想要使插入符号上下动画，可以使用小JS

​

const caret = document.querySelector('.caret');

caret.addEventListener('click', (e) => {
  e.preventDefault();
  caret.classList.toggle('collapsed');

  if (caret.classList.contains('collapsed')) {
    caret.setAttribute("aria-expanded", "true");
  } else {
    caret.setAttribute("aria-expanded", "false");
  }

  console.log(caret.getAttribute('aria-expanded'))
});

* {
  margin: 0;
  padding: 0;
  outline: 0;
  box-sizing: border-box;
}

body {
  height: 100vh;
  display: grid;
  place-items: center;
}

.caret {
  width: 70px;
  height: 70px;
  display: grid;
  place-items: center;
  border-radius: 0.25rem;
  border: 1px solid #e5e5e5;
}

.caret svg {
  width: 64px;
  height: 64px;
  transition: transform 250ms ease;
}

.caret.collapsed svg {
  transform: rotate(180deg);
}

<a href="#" class="caret" aria-expanded="false">
  <svg width="24" height="24" viewBox="0 0 24 24">
        <path d="m11.998 17 7-8h-14z"></path>
    </svg>
</a>

​

Answer 2

如果要使用普通同胞选择器( i )，您必须先选择同级标记，然后选择~标记。例如：

a[aria-expanded="true"] ~ span .fa-caret-up {...}

工作示例：

​

a[aria-expanded=true] ~ span .fa-caret-up {
  display: none;
}

a[aria-expanded=false] ~ span .fa-caret-down {
  display: none;
}

<script src="https://kit.fontawesome.com/79efab5353.js" crossorigin="anonymous"></script>

<div class="container-fluid d-flex justify-content-center">
  <div class="row">

    <div class="col-lg-4 col-md-6 col-12 pb-5">
      <h4 class="text-center">Moodle</h4>

      <div class="d-flex justify-content-between align-items-center mr-5">
        <a href="#" data-toggle="collapse" data-target="#footer_ups" aria-expanded="false" aria-controls="footer_ups">
          <span class="flex-grow-1"><i class="fa fa-chevron-right pr-2"></i>Uni</span>
        </a>
        <span class="badge badge-primary badge-pill">7 <i class="fa fa-caret-down"></i><i class="fa fa-caret-up"></i></span>
      </div>

      <div id="footer_ups" class="collapse pl-3" aria-labelledby="Établissements">
        <ul class="list-unstyled">
          <li><i class="fa fa-angle-right pr-2"></i> <a href="https://" alt="Site internet" target="_blank">Website</a></li>
        </ul>
      </div>

    </div>

  </div>
</div>

​